Ordination of the Italian and SE–European A. altissima forest associations and Box plots of chorological types. (a) NMDS scaling ordination plot (clusters are superimposed to NMDS plot) of the A. altissima forest coenoses here considered (dashed line) and Balloto nigrae-Ailanthetum altissimae from SE–Europe (continue line). Legend: Circles: Aro italici-Ailanthetum altissimae; Squares: Asparago acutifolii-Ailanthetum altissimae; Triangles: Balloto nigrae-Ailanthetum altissimae. (b) Comparison of the significant chorological types (weighted percentage values) between the new Italian A. altissima forest associations considered altogether (labelled as 1) and the Balloto nigrae-Ailathetum altissimae association (labelled as 2). (b.1) Mediterranean chorotype p value=2.84e–11; (b.2) Boreal chorotype p value=3.26e–11; (b.3) Wide distribution chorotype p value=1.95e–05; (b.4) Alien species (neophytes and archeopytes) p value =3.55e–10.

 
 
  Part of: Montecchiari S, Allegrezza M, Pelliccia V, Tesei G (2020) First syntaxonomical contribution to the invasive Ailanthus altissima (Mill.) Swingle forest communities at its southern limit in Europe. Plant Sociology 57(2): 145-160. https://doi.org/10.3897/pls2020572/06